Datasheet LTC3649 (Analog Devices) - 3

LTC3649
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TJ = 25°C. (Note 5) VIN = 24V, VEXTVCC = 0V unless otherwise noted. (Notes 5, 7) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Input Supply Operating Voltage Range 3.1 60 V VOUT Output Operating Voltage Range (Note 4) 0.05 VIN V IVIN Input Quiescent Current Shutdown Mode; VRUN = 0V 18 30 µA Burst Mode Operation 440 600 µA FC Mode (Note 6) 1.4 2.5 mA IISET Reference Current VISET = 3.3V 49.6 50 50.4 µA l 49.4 50 50.6 µA ΔVOUT(LOAD+LINE) Output Voltage Load + Line Regulation l 0.1 0.5 % VEA(OFFSET) Error Amp Input Offset VISET = 3.3V –5 5 mV gm (EA) Error Amplifier Transconductance VITH = 0.7V, VOUT = 3.3V 400 550 700 µS ILSW Topside NMOS Switch Leakage 0.1 1 µA RSW-GND SW Resistance to GND 0.5 1 1.5 MΩ RDS(ON) Topside NMOS On-Resistance 110 mΩ Bottom Side NMOS On-Resistance 50 mΩ DMAX Maximum Duty Cycle VISET = VIN (Note 4) 95 % tON(MIN) Minimum On-Time 60 ns VRUN RUN Input Rising l 1.08 1.2 1.32 V RUN Hysteresis 120 mV IRUN RUN Input Current VRUN = 12V 0 10 nA VMODE/SYNC Burst Mode Operation 0.4 V FC Mode 1.2 V IMODE/SYNC MODE/SYNC Input Current VMODE/SYNC = 0V –8 –5 µA ILIM Peak Current Limit 5.7 6 6.3 A l 5.4 6 6.6 A VUVLO VINTVCC Undervoltage Lockout VIN Rising l 2.4 2.65 2.9 V VUVLO(HYS) VINTVCC Undervoltage Lockout Hysteresis 200 mV VOVLO VIN Overvoltage Lockout Rising 64 68 V VOVLO(HYS) VIN Overvoltage Lockout Hysteresis 2 4 V fOSC Oscillator Frequency RT = 100kΩ l 0.92 1.00 1.08 MHz fSYNC SYNC Capture Range % of Programmed Frequency 50 150 % VINTVCC VINTVCC LDO Output Voltage 3.25 3.45 3.65 V VIN > 5.0V, VEXTVCC > 3.2V 2.85 3.0 3.15 V VEXTVCC EXTVCC Switchover Voltage 3.1 3.15 3.2 V l 3.25 V RVOUT VOUT Resistance to GND VOUT = 5V 80 100 120 kΩ IPGDFB PGDFB Leakage Current VPGDFB = 0.6V 0 100 nA OVPGDFB Output Overvoltage PGOOD Upper Threshold PGFB Rising 0.63 0.645 0.66 V UVPGDFB Output Undervoltage PGOOD Lower Threshold PGFB Falling 0.54 0.555 0.57 V ΔVPGDFB PGOOD Hysteresis PGFB Returning 10 mV RPGOOD PGOOD Pull-Down Resistance 550 Ω IPGOOD(LEAK) PGOOD Leakage Current VPGOOD = 3.3V 100 nA tPGOOD PGOOD Delay PGOOD Low to High 16 Switch Cycles PGOOD High to Low 64 Switch Cycles AIMON IOUT/IIMON Ratio of Output Current to IIMON 38.5 40 41.5 k Current l 36 40 44 k IIMON IMON Pin Current IOUT = 4A 96 100 104 µA l 90 100 110 µA VIMON Regulated IMON Voltage Under Output Current Regulation l 1.94 2.0 2.06 V VVINREG Input Voltage Regulation Voltage l 1.85 2.0 2.15 V IVINREG VINREG Leakage Current VVINREG = 3.3V 0 0.1 µA 3649fb For more information www.linear.com/LTC3649 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts